Sofa



FIG. 1 is a front, right-side, top perspective view of the sofa;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right-side elevational view thereof; and,

FIG. 5 is a top plan view thereof. 

CLAIM The ornamental design for a sofa, as shown and described. 